Event: B(2) Division

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Opponent	Rating	Result
Samuel Esayas	1827	0 - 1
Michael Tebelev	1909	0 - 1
Leo Cheung	1583	1 - 0

performance = (sum(opponents ratings) + 400(wins-losses)) / games

1640 = (5319 + 400 * (1 - 2)) / 3)